pgsql: Add PQclear() calls, for completeness (exits shortly anyway).

Log Message:
-----------
Add PQclear() calls, for completeness (exits shortly anyway).

Modified Files:
--------------
    pgsql/src/bin/scripts:
        createdb.c (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/createdb.c.diff?r1=1.18&r2=1.19)
        createlang.c (r1.22 -> r1.23)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/createlang.c.diff?r1=1.22&r2=1.23)
        createuser.c (r1.29 -> r1.30)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/createuser.c.diff?r1=1.29&r2=1.30)
        dropdb.c (r1.16 -> r1.17)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/dropdb.c.diff?r1=1.16&r2=1.17)
        droplang.c (r1.19 -> r1.20)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/droplang.c.diff?r1=1.19&r2=1.20)
        dropuser.c (r1.17 -> r1.18)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/dropuser.c.diff?r1=1.17&r2=1.18)